Use your multimeter and set it on the ohm scale. Now measure and record the resistance of each winding. The highest reading you get is the starting winding and the lowest reading is the current winding.
Using the ohmmeter: Disconnect all power from the device. Check separately the three wires T1, T2, T3 (the three phases) of the ground wire. The lessons should be endless. If it is zero or shows no continuity, there is a problem with the motor or cable.
If you find that all ohm readings are correct:
- Set the ohmmeter to the highest range.
- Place the tip on the metal housing of the capacitor (be sure to scrape off any rust or paint for good contact)
- Measure each stick against the floor.
- Any reading that cannot be read indefinitely indicates a grounded coil.
Understanding the measured values We know that the starting winding has the highest resistance and the motor winding the weakest. Don’t be fooled by the 8 and 5 ohm values here! Its initial winding is 5 ohms, and the round winding is 3 ohms.
The starting winding also has more turns and the size of the conductor is smaller, while the continuous winding has fewer turns and the size of the conductor is large compared to the starting winding.
Test with a multimeter set to low ohms (typically 200) between each winding terminal and the metal motor case. If any of these readings indicate that the engine is faulty, do not use it. If it is not grounded, the house can be powered with the supply voltage.
The windings (all three in a three-phase motor) should be weak but not zero. The smaller the motor, the higher this value, but it shouldn’t be open. It is usually low enough (less than 30) to hear the continuity beeper.
Direct short-circuit test in the motor current windings in asynchronous (brushless) motors. Hold the 30,000 ohm multimeter and touch one test lead with one clamp and the other with another clamp. Each set of windings should have approximately the same ohmic value.
The rotor is the rotating part of the engine. The stator winding of the 1Ø asynchronous motor consists of two parts: the main winding and the auxiliary winding. Usually the additional winding is perpendicular to the main winding. In a 1Ø induction motor, the multi-turn winding is called the main winding.
There are four basic types of motor and drive control: AC, DC, servo and stepper, each of which has an input power type that is modified for the desired output function to suit a program.
A starting winding, also called an auxiliary winding, is used to generate the torque needed to start a single-phase induction motor. In this type of motor, this winding generates the rotating magnetic field by varying the current-voltage ratio.
Motor in ceiling fans:
As mentioned above, single-phase induction motors do not start automatically because a single-phase power supply cannot generate a rotating magnetic field. To generate rotating magnetic fields, we need a two-phase or three-phase power supply. But we can create a rotating magnetic field with a two-phase structure.
Lesson 17. Motors
The addition of a capacitor in series with the starting winding allows for greater phase shift and movement in the magnetic field and thus provides a higher starting torque for applications where the motor must start under load.
Although an air conditioning system may still operate with reduced cooling capacity after a refrigerant leak, it causes severe damage that ultimately leads to an increased need for repairs and possibly a complete system failure. Leaking refrigerant also threatens to damage the compressor and lead to overheating.